session.c

   1 /*
   2  * This file is part of the sigrok-cli project.
   3  *
   4  * Copyright (C) 2013 Bert Vermeulen <bert@biot.com>
   5  *
   6  * This program is free software: you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation, either version 3 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "sigrok-cli.h"
  21 #include <glib.h>
  22 #include <glib/gstdio.h>
  23 #include <string.h>
  24 #include <stdlib.h>
  25
  26 static int default_output_format = FALSE;
  27 static uint64_t limit_samples = 0;
  28 static uint64_t limit_frames = 0;
  29
  30 #ifdef HAVE_SRD
  31 extern struct srd_session *srd_sess;
  32 #endif
  33
  34 static int set_limit_time(const struct sr_dev_inst *sdi)
  35 {
  36         GVariant *gvar;
  37         uint64_t time_msec;
  38         uint64_t samplerate;
  39
  40         if (!(time_msec = sr_parse_timestring(opt_time))) {
  41                 g_critical("Invalid time '%s'", opt_time);
  42                 return SR_ERR;
  43         }
  44
  45         if (sr_dev_has_option(sdi, SR_CONF_LIMIT_MSEC)) {
  46                 gvar = g_variant_new_uint64(time_msec);
  47                 if (sr_config_set(sdi, NULL, SR_CONF_LIMIT_MSEC, gvar) != SR_OK) {
  48                         g_critical("Failed to configure time limit.");
  49                         return SR_ERR;
  50                 }
  51         } else if (sr_dev_has_option(sdi, SR_CONF_SAMPLERATE)) {
  52                 /* Convert to samples based on the samplerate.  */
  53                 sr_config_get(sdi->driver, sdi, NULL, SR_CONF_SAMPLERATE, &gvar);
  54                 samplerate = g_variant_get_uint64(gvar);
  55                 g_variant_unref(gvar);
  56                 limit_samples = (samplerate) * time_msec / (uint64_t)1000;
  57                 if (limit_samples == 0) {
  58                         g_critical("Not enough time at this samplerate.");
  59                         return SR_ERR;
  60                 }
  61                 gvar = g_variant_new_uint64(limit_samples);
  62                 if (sr_config_set(sdi, NULL, SR_CONF_LIMIT_SAMPLES, gvar) != SR_OK) {
  63                         g_critical("Failed to configure time-based sample limit.");
  64                         return SR_ERR;
  65                 }
  66         } else {
  67                 g_critical("This device does not support time limits.");
  68                 return SR_ERR;
  69         }
  70
  71         return SR_OK;
  72 }
  73
  74 GHashTable *generic_arg_to_opt(const struct sr_option *opts, GHashTable *genargs)
  75 {
  76         GHashTable *hash;
  77         GVariant *gvar;
  78         const struct sr_option *opt;
  79         char *s;
  80
  81         hash = g_hash_table_new_full(g_str_hash, g_str_equal, g_free,
  82                         (GDestroyNotify)g_variant_unref);
  83         for (opt = opts; opt->id && opt->def; opt++) {
  84                 if (!(s = g_hash_table_lookup(genargs, opt->id)))
  85                         continue;
  86                 if (g_variant_is_of_type(opt->def, G_VARIANT_TYPE_UINT32)) {
  87                         gvar = g_variant_new_uint32(strtoul(s, NULL, 10));
  88                         g_hash_table_insert(hash, g_strdup(opt->id),
  89                                         g_variant_ref_sink(gvar));
  90                 } else {
  91                         g_critical("Don't know how to convert option '%s' to %s!",
  92                                         opt->id, g_variant_get_type_string(opt->def));
  93                  }
  94         }
  95
  96         return hash;
  97 }
  98
  99 const struct sr_output *setup_output_format(const struct sr_dev_inst *sdi)
 100 {
 101         const struct sr_output_module *omod;
 102         const struct sr_option *opts;
 103         const struct sr_output *o;
 104         GHashTable *fmtargs, *fmtopts;
 105         char *fmtspec;
 106
 107         if (opt_output_format && !strcmp(opt_output_format, "sigrok")) {
 108                 /* Doesn't really exist as an output module - this is
 109                  * the session save mode. */
 110                 g_free(opt_output_format);
 111                 opt_output_format = NULL;
 112         }
 113
 114         if (!opt_output_format) {
 115                 opt_output_format = DEFAULT_OUTPUT_FORMAT;
 116                 /* we'll need to remember this so when saving to a file
 117                  * later, sigrok session format will be used.
 118                  */
 119                 default_output_format = TRUE;
 120         }
 121
 122         fmtargs = parse_generic_arg(opt_output_format, TRUE);
 123         fmtspec = g_hash_table_lookup(fmtargs, "sigrok_key");
 124         if (!fmtspec)
 125                 g_critical("Invalid output format.");
 126         if (!(omod = sr_output_find(fmtspec)))
 127                 g_critical("Unknown output format '%s'.", fmtspec);
 128         g_hash_table_remove(fmtargs, "sigrok_key");
 129         if ((opts = sr_output_options_get(omod))) {
 130                 fmtopts = generic_arg_to_opt(opts, fmtargs);
 131                 sr_output_options_free(omod);
 132         } else
 133                 fmtopts = NULL;
 134         o = sr_output_new(omod, fmtopts, sdi);
 135         if (fmtopts)
 136                 g_hash_table_destroy(fmtopts);
 137         g_hash_table_destroy(fmtargs);
 138
 139         return o;
 140 }
 141
 142 void datafeed_in(const struct sr_dev_inst *sdi,
 143                 const struct sr_datafeed_packet *packet, void *cb_data)
 144 {
 145         const struct sr_datafeed_meta *meta;
 146         const struct sr_datafeed_logic *logic;
 147         const struct sr_datafeed_analog *analog;
 148         struct sr_session *session;
 149         struct sr_config *src;
 150         struct sr_channel *ch;
 151         static const struct sr_output *o = NULL;
 152         static const struct sr_output *oa = NULL;
 153         static uint64_t rcvd_samples_logic = 0;
 154         static uint64_t rcvd_samples_analog = 0;
 155         static uint64_t samplerate = 0;
 156         static int triggered = 0;
 157         static FILE *outfile = NULL;
 158         GSList *l;
 159         GString *out;
 160         GVariant *gvar;
 161         uint64_t end_sample;
 162         uint64_t input_len;
 163         int i;
 164         char **channels;
 165
 166         /* If the first packet to come in isn't a header, don't even try. */
 167         if (packet->type != SR_DF_HEADER && o == NULL)
 168                 return;
 169
 170         session = cb_data;
 171         switch (packet->type) {
 172         case SR_DF_HEADER:
 173                 g_debug("cli: Received SR_DF_HEADER.");
 174                 o = setup_output_format(sdi);
 175
 176                 /* Set up backup analog output module. */
 177                 oa = sr_output_new(sr_output_find("analog"), NULL, sdi);
 178
 179                 /* Prepare non-stdout output. */
 180                 outfile = stdout;
 181                 if (opt_output_file) {
 182                         if (default_output_format) {
 183                                 outfile = NULL;
 184                         } else {
 185                                 /* saving to a file in whatever format was set
 186                                  * with --format, so all we need is a filehandle */
 187                                 outfile = g_fopen(opt_output_file, "wb");
 188                         }
 189                 }
 190                 rcvd_samples_logic = rcvd_samples_analog = 0;
 191
 192                 if (sr_config_get(sdi->driver, sdi, NULL, SR_CONF_SAMPLERATE,
 193                                 &gvar) == SR_OK) {
 194                         samplerate = g_variant_get_uint64(gvar);
 195                         g_variant_unref(gvar);
 196                 }
 197
 198 #ifdef HAVE_SRD
 199                 if (opt_pds) {
 200                         if (samplerate) {
 201                                 if (srd_session_metadata_set(srd_sess, SRD_CONF_SAMPLERATE,
 202                                                 g_variant_new_uint64(samplerate)) != SRD_OK) {
 203                                         g_critical("Failed to configure decode session.");
 204                                         break;
 205                                 }
 206                         }
 207                         if (srd_session_start(srd_sess) != SRD_OK) {
 208                                 g_critical("Failed to start decode session.");
 209                                 break;
 210                         }
 211                 }
 212 #endif
 213                 break;
 214
 215         case SR_DF_META:
 216                 g_debug("cli: Received SR_DF_META.");
 217                 meta = packet->payload;
 218                 for (l = meta->config; l; l = l->next) {
 219                         src = l->data;
 220                         switch (src->key) {
 221                         case SR_CONF_SAMPLERATE:
 222                                 samplerate = g_variant_get_uint64(src->data);
 223                                 g_debug("cli: Got samplerate %"PRIu64" Hz.", samplerate);
 224 #ifdef HAVE_SRD
 225                                 if (opt_pds) {
 226                                         if (srd_session_metadata_set(srd_sess, SRD_CONF_SAMPLERATE,
 227                                                         g_variant_new_uint64(samplerate)) != SRD_OK) {
 228                                                 g_critical("Failed to pass samplerate to decoder.");
 229                                         }
 230                                 }
 231 #endif
 232                                 break;
 233                         case SR_CONF_SAMPLE_INTERVAL:
 234                                 samplerate = g_variant_get_uint64(src->data);
 235                                 g_debug("cli: Got sample interval %"PRIu64" ms.", samplerate);
 236                                 break;
 237                         default:
 238                                 /* Unknown metadata is not an error. */
 239                                 break;
 240                         }
 241                 }
 242                 break;
 243
 244         case SR_DF_TRIGGER:
 245                 g_debug("cli: Received SR_DF_TRIGGER.");
 246                 triggered = 1;
 247                 break;
 248
 249         case SR_DF_LOGIC:
 250                 logic = packet->payload;
 251                 g_message("cli: Received SR_DF_LOGIC (%"PRIu64" bytes, unitsize = %d).",
 252                                 logic->length, logic->unitsize);
 253                 if (logic->length == 0)
 254                         break;
 255
 256                 /* Don't store any samples until triggered. */
 257                 if (opt_wait_trigger && !triggered)
 258                         break;
 259
 260                 if (limit_samples && rcvd_samples_logic >= limit_samples)
 261                         break;
 262
 263                 end_sample = rcvd_samples_logic + logic->length / logic->unitsize;
 264                 /* Cut off last packet according to the sample limit. */
 265                 if (limit_samples && end_sample > limit_samples)
 266                         end_sample = limit_samples;
 267                 input_len = (end_sample - rcvd_samples_logic) * logic->unitsize;
 268
 269                 if (opt_output_file && default_output_format) {
 270                         /* Saving to a session file. */
 271                         if (rcvd_samples_logic == 0) {
 272                                 /* First packet with logic data, init session file. */
 273                                 channels = g_malloc(sizeof(char *) * g_slist_length(sdi->channels));
 274                                 for (i = 0, l = sdi->channels; l; l = l->next) {
 275                                         ch = l->data;
 276                                         if (ch->enabled && ch->type == SR_CHANNEL_LOGIC)
 277                                                 channels[i++] = ch->name;
 278                                 }
 279                                 channels[i] = NULL;
 280                                 sr_session_save_init(session, opt_output_file,
 281                                                 samplerate, channels);
 282                                 g_free(channels);
 283                         }
 284                         save_chunk_logic(session, logic->data, input_len, logic->unitsize);
 285                 } else {
 286                         if (opt_pds) {
 287 #ifdef HAVE_SRD
 288                                 if (srd_session_send(srd_sess, rcvd_samples_logic, end_sample,
 289                                                 logic->data, input_len) != SRD_OK)
 290                                         sr_session_stop(session);
 291 #endif
 292                         }
 293                 }
 294
 295                 rcvd_samples_logic = end_sample;
 296                 break;
 297
 298         case SR_DF_ANALOG:
 299                 analog = packet->payload;
 300                 g_message("cli: Received SR_DF_ANALOG (%d samples).", analog->num_samples);
 301                 if (analog->num_samples == 0)
 302                         break;
 303
 304                 if (limit_samples && rcvd_samples_analog >= limit_samples)
 305                         break;
 306
 307                 rcvd_samples_analog += analog->num_samples;
 308                 break;
 309
 310         case SR_DF_FRAME_BEGIN:
 311                 g_debug("cli: Received SR_DF_FRAME_BEGIN.");
 312                 break;
 313
 314         case SR_DF_FRAME_END:
 315                 g_debug("cli: Received SR_DF_FRAME_END.");
 316                 break;
 317
 318         default:
 319                 break;
 320         }
 321
 322         if (o && outfile && !opt_pds) {
 323                 if (sr_output_send(o, packet, &out) == SR_OK) {
 324                         if (!out || (out->len == 0 && default_output_format
 325                                         && packet->type == SR_DF_ANALOG)) {
 326                                 /* The user didn't specify an output module,
 327                                  * but needs to see this analog data. */
 328                                 sr_output_send(oa, packet, &out);
 329                         }
 330                         if (out && out->len > 0) {
 331                                 fwrite(out->str, 1, out->len, outfile);
 332                                 fflush(outfile);
 333                         }
 334                         if (out)
 335                                 g_string_free(out, TRUE);
 336                 }
 337         }
 338
 339         /* SR_DF_END needs to be handled after the output module's receive()
 340          * is called, so it can properly clean up that module. */
 341         if (packet->type == SR_DF_END) {
 342                 g_debug("cli: Received SR_DF_END.");
 343
 344                 if (o)
 345                         sr_output_free(o);
 346                 o = NULL;
 347
 348                 sr_output_free(oa);
 349                 oa = NULL;
 350
 351                 if (outfile && outfile != stdout)
 352                         fclose(outfile);
 353
 354                 if (opt_output_file && default_output_format)
 355                         /* Flush whatever is left out to the session file. */
 356                         save_chunk_logic(session, NULL, 0, 0);
 357
 358                 if (limit_samples) {
 359                         if (rcvd_samples_logic > 0 && rcvd_samples_logic < limit_samples)
 360                                 g_warning("Device only sent %" PRIu64 " samples.",
 361                                            rcvd_samples_logic);
 362                         else if (rcvd_samples_analog > 0 && rcvd_samples_analog < limit_samples)
 363                                 g_warning("Device only sent %" PRIu64 " samples.",
 364                                            rcvd_samples_analog);
 365                 }
 366         }
 367
 368 }
 369
 370 int opt_to_gvar(char *key, char *value, struct sr_config *src)
 371 {
 372         const struct sr_config_info *srci;
 373         double tmp_double, dlow, dhigh;
 374         uint64_t tmp_u64, p, q, low, high;
 375         GVariant *rational[2], *range[2];
 376         gboolean tmp_bool;
 377         int ret;
 378
 379         if (!(srci = sr_config_info_name_get(key))) {
 380                 g_critical("Unknown device option '%s'.", (char *) key);
 381                 return -1;
 382         }
 383         src->key = srci->key;
 384
 385         if ((value == NULL) &&
 386                 (srci->datatype != SR_T_BOOL)) {
 387                 g_critical("Option '%s' needs a value.", (char *)key);
 388                 return -1;
 389         }
 390
 391         ret = 0;
 392         switch (srci->datatype) {
 393         case SR_T_UINT64:
 394                 ret = sr_parse_sizestring(value, &tmp_u64);
 395                 if (ret != 0)
 396                         break;
 397                 src->data = g_variant_new_uint64(tmp_u64);
 398                 break;
 399         case SR_T_INT32:
 400                 ret = sr_parse_sizestring(value, &tmp_u64);
 401                 if (ret != 0)
 402                         break;
 403                 src->data = g_variant_new_int32(tmp_u64);
 404                 break;
 405         case SR_T_STRING:
 406                 src->data = g_variant_new_string(value);
 407                 break;
 408         case SR_T_BOOL:
 409                 if (!value)
 410                         tmp_bool = TRUE;
 411                 else
 412                         tmp_bool = sr_parse_boolstring(value);
 413                 src->data = g_variant_new_boolean(tmp_bool);
 414                 break;
 415         case SR_T_FLOAT:
 416                 tmp_double = strtof(value, NULL);
 417                 src->data = g_variant_new_double(tmp_double);
 418                 break;
 419         case SR_T_RATIONAL_PERIOD:
 420                 if ((ret = sr_parse_period(value, &p, &q)) != SR_OK)
 421                         break;
 422                 rational[0] = g_variant_new_uint64(p);
 423                 rational[1] = g_variant_new_uint64(q);
 424                 src->data = g_variant_new_tuple(rational, 2);
 425                 break;
 426         case SR_T_RATIONAL_VOLT:
 427                 if ((ret = sr_parse_voltage(value, &p, &q)) != SR_OK)
 428                         break;
 429                 rational[0] = g_variant_new_uint64(p);
 430                 rational[1] = g_variant_new_uint64(q);
 431                 src->data = g_variant_new_tuple(rational, 2);
 432                 break;
 433         case SR_T_UINT64_RANGE:
 434                 if (sscanf(value, "%"PRIu64"-%"PRIu64, &low, &high) != 2) {
 435                         ret = -1;
 436                         break;
 437                 } else {
 438                         range[0] = g_variant_new_uint64(low);
 439                         range[1] = g_variant_new_uint64(high);
 440                         src->data = g_variant_new_tuple(range, 2);
 441                 }
 442                 break;
 443         case SR_T_DOUBLE_RANGE:
 444                 if (sscanf(value, "%lf-%lf", &dlow, &dhigh) != 2) {
 445                         ret = -1;
 446                         break;
 447                 } else {
 448                         range[0] = g_variant_new_double(dlow);
 449                         range[1] = g_variant_new_double(dhigh);
 450                         src->data = g_variant_new_tuple(range, 2);
 451                 }
 452                 break;
 453         default:
 454                 ret = -1;
 455         }
 456
 457         return ret;
 458 }
 459
 460 int set_dev_options(struct sr_dev_inst *sdi, GHashTable *args)
 461 {
 462         struct sr_config src;
 463         struct sr_channel_group *cg;
 464         GHashTableIter iter;
 465         gpointer key, value;
 466         int ret;
 467
 468         g_hash_table_iter_init(&iter, args);
 469         while (g_hash_table_iter_next(&iter, &key, &value)) {
 470                 if ((ret = opt_to_gvar(key, value, &src)) != 0)
 471                         return ret;
 472                 cg = select_channel_group(sdi);
 473                 ret = sr_config_set(sdi, cg, src.key, src.data);
 474                 if (ret != SR_OK) {
 475                         g_critical("Failed to set device option '%s'.", (char *)key);
 476                         return ret;
 477                 }
 478         }
 479
 480         return SR_OK;
 481 }
 482
 483 void run_session(void)
 484 {
 485         GSList *devices;
 486         GHashTable *devargs;
 487         GVariant *gvar;
 488         struct sr_session *session;
 489         struct sr_trigger *trigger;
 490         struct sr_dev_inst *sdi;
 491         uint64_t min_samples, max_samples;
 492
 493         devices = device_scan();
 494         if (!devices) {
 495                 g_critical("No devices found.");
 496                 return;
 497         }
 498         if (g_slist_length(devices) > 1) {
 499                 g_critical("sigrok-cli only supports one device for capturing.");
 500                 g_slist_free(devices);
 501                 return;
 502         }
 503         sdi = devices->data;
 504         g_slist_free(devices);
 505
 506         sr_session_new(&session);
 507         sr_session_datafeed_callback_add(session, datafeed_in, NULL);
 508
 509         if (sr_dev_open(sdi) != SR_OK) {
 510                 g_critical("Failed to open device.");
 511                 return;
 512         }
 513
 514         if (sr_session_dev_add(session, sdi) != SR_OK) {
 515                 g_critical("Failed to add device to session.");
 516                 sr_session_destroy(session);
 517                 return;
 518         }
 519
 520         if (opt_config) {
 521                 if ((devargs = parse_generic_arg(opt_config, FALSE))) {
 522                         if (set_dev_options(sdi, devargs) != SR_OK)
 523                                 return;
 524                         g_hash_table_destroy(devargs);
 525                 }
 526         }
 527
 528         if (select_channels(sdi) != SR_OK) {
 529                 g_critical("Failed to set channels.");
 530                 sr_session_destroy(session);
 531                 return;
 532         }
 533
 534         if (opt_triggers) {
 535                 if (!parse_triggerstring(sdi, opt_triggers, &trigger)) {
 536                         sr_session_destroy(session);
 537                         return;
 538                 }
 539                 if (sr_session_trigger_set(session, trigger) != SR_OK) {
 540                         sr_session_destroy(session);
 541                         return;
 542                 }
 543         }
 544
 545         if (opt_continuous) {
 546                 if (!sr_dev_has_option(sdi, SR_CONF_CONTINUOUS)) {
 547                         g_critical("This device does not support continuous sampling.");
 548                         sr_session_destroy(session);
 549                         return;
 550                 }
 551         }
 552
 553         if (opt_time) {
 554                 if (set_limit_time(sdi) != SR_OK) {
 555                         sr_session_destroy(session);
 556                         return;
 557                 }
 558         }
 559
 560         if (opt_samples) {
 561                 if ((sr_parse_sizestring(opt_samples, &limit_samples) != SR_OK)) {
 562                         g_critical("Invalid sample limit '%s'.", opt_samples);
 563                         sr_session_destroy(session);
 564                         return;
 565                 }
 566                 if (sr_config_list(sdi->driver, sdi, NULL,
 567                                 SR_CONF_LIMIT_SAMPLES, &gvar) == SR_OK) {
 568                         /* The device has no compression, or compression is turned
 569                          * off, and publishes its sample memory size. */
 570                         g_variant_get(gvar, "(tt)", &min_samples, &max_samples);
 571                         g_variant_unref(gvar);
 572                         if (limit_samples < min_samples) {
 573                                 g_critical("The device stores at least %"PRIu64
 574                                                 " samples with the current settings.", min_samples);
 575                         }
 576                         if (limit_samples > max_samples) {
 577                                 g_critical("The device can store only %"PRIu64
 578                                                 " samples with the current settings.", max_samples);
 579                         }
 580                 }
 581                 gvar = g_variant_new_uint64(limit_samples);
 582                 if (sr_config_set(sdi, NULL, SR_CONF_LIMIT_SAMPLES, gvar) != SR_OK) {
 583                         g_critical("Failed to configure sample limit.");
 584                         sr_session_destroy(session);
 585                         return;
 586                 }
 587         }
 588
 589         if (opt_frames) {
 590                 if ((sr_parse_sizestring(opt_frames, &limit_frames) != SR_OK)) {
 591                         g_critical("Invalid sample limit '%s'.", opt_samples);
 592                         sr_session_destroy(session);
 593                         return;
 594                 }
 595                 gvar = g_variant_new_uint64(limit_frames);
 596                 if (sr_config_set(sdi, NULL, SR_CONF_LIMIT_FRAMES, gvar) != SR_OK) {
 597                         g_critical("Failed to configure frame limit.");
 598                         sr_session_destroy(session);
 599                         return;
 600                 }
 601         }
 602
 603         if (sr_session_start(session) != SR_OK) {
 604                 g_critical("Failed to start session.");
 605                 sr_session_destroy(session);
 606                 return;
 607         }
 608
 609         if (opt_continuous)
 610                 add_anykey(session);
 611
 612         sr_session_run(session);
 613
 614         if (opt_continuous)
 615                 clear_anykey();
 616
 617         sr_session_datafeed_callback_remove_all(session);
 618         sr_session_destroy(session);
 619
 620 }
 621
 622 void save_chunk_logic(struct sr_session *session, uint8_t *data,
 623                 uint64_t data_len, int unitsize)
 624 {
 625         static uint8_t *buf = NULL;
 626         static int buf_len = 0;
 627         static int last_unitsize = 0;
 628         int max;
 629
 630         if (!buf)
 631                 buf = g_malloc(SAVE_CHUNK_SIZE);
 632
 633         while (data_len > SAVE_CHUNK_SIZE) {
 634                 save_chunk_logic(session, data, SAVE_CHUNK_SIZE, unitsize);
 635                 data += SAVE_CHUNK_SIZE;
 636                 data_len -= SAVE_CHUNK_SIZE;
 637         }
 638
 639         if (buf_len + data_len > SAVE_CHUNK_SIZE) {
 640                 max = (SAVE_CHUNK_SIZE - buf_len) / unitsize * unitsize;
 641                 memcpy(buf + buf_len, data, max);
 642                 sr_session_append(session, opt_output_file, buf, unitsize,
 643                                 (buf_len + max) / unitsize);
 644                 memcpy(buf, data + max, data_len - max);
 645                 buf_len = data_len - max;
 646         } else if (data_len == 0 && last_unitsize != 0) {
 647                 /* End of data, flush the buffer out. */
 648                 sr_session_append(session, opt_output_file, buf, last_unitsize,
 649                                 buf_len / last_unitsize);
 650         } else {
 651                 /* Buffer chunk. */
 652                 memcpy(buf + buf_len, data, data_len);
 653                 buf_len += data_len;
 654         }
 655         last_unitsize = unitsize;
 656
 657 }